The police said the call centre of the Delhi International Airport Ltd (DIAL) received a call about spotting of the big balloon following which the airport was put on alert.

DCP of IGI airport DK Gupta said all security agencies have been informed about the information though police has not spotted the object.

"The airport was put on high alert after the DIAL call centre received a call about a big balloon spotted near the airport this evening.

"The call was received around 5 pm and the caller said that the big balloon was heading from the airport to Aya Nagar following which an alert was issued at the IGI and all security agencies have been informed about it," Gupta told reporters.

A mysterious balloon-shaped object was shot down yesterday by a Sukhoi-30 fighter aircraft in Rajasthan's Barmer district, bordering Pakistan, after the IAF radar detected it. Defence officials today said that no no dangerouspayload was found.